Jim,

As Edward said measure from fixed point on the frame on both sides to center body at wheel well lip. I had mine alignment professionally done in go cart stage before body was fitted for the first time. It can make a big difference especially forward and aft in the wheel opening as well as width. I only needed to move the DS QJ mounts 3/4" to the PS. It will bend easy with a 2x4 weaved between the QJ mount and the upper shock bracket. couple tugs and it was perfect. Some are not using the new brackets and have more experience than I but I liked them and will keep them with no rubber grommets in the front mount holes.

Good luck with rest of the build